* {
    padding: 0;
    margin: 0;
    list-style: none;
}

.copyright {
    position: fixed;
    z-index: 9999999
}

h1 {
    text-align: center;
    margin: 10px 0 10px;
}

#app {
    width: 100%;
    position: fixed;
    top: 0;
    bottom: 0;
}

#app > div {
    width: 350px;
    /*background: #ddd;*/
    margin: 10px auto;
}

table {
    border: 2px solid #666;
}

td {
    font-size: 20px;
    font-weight: 900;
    color: deeppink;
    width:64px;
    height: 64px;
    border: 1px solid #666;
    text-align: center;
    overflow: hidden;
}